有三个输入端的或非门电路，要求输出高电平，其输入端应是（）。

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问题单项选择题

A.全部为高电平

B.至少一个端为低电平

C.全部为低电平

D.至少一个端为高电平

答案

参考答案：C

选择题

Mr. Full apologized ______ the children ______ what he had done.

A．for; to

B．to; for

C．for; for

D．to; with

选择题

________ no point in beating around the bush.Let’s ______.[ ]

A．It’s；come straight to the point

B．There’s；come to the point

C．This is；get to the point

D．That is；reach the point